The BIKONE BSA MTB Shimano  bottom bracket is engineered exclusively for mountain bikers who demand the most in durability and performance on tough trails. This bottom bracket is asymmetrical because it takes up the space previously occupied by the spacer, making it more robust. With our Dual Cup Technology (DC Tech) and top quality steel bearings, you will enjoy the smoothest rides, ensuring every pedal stroke feels effortless on any terrain. Because conquering trails calls for the best. Assembly instructions and spacer list: Click here. Note: For correct compatibility, mountain cranks should always be mounted on mountain frames.

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